Mode of forming teeth on cotton-gin saws



H. v. & 0. F. SGATTERGOOD. MODE 0F FORMING TEETH ON COTTON GIN SAWS. No. 415,066.

(No Model.)

Patented Nov. 12, 1889.

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*KJNTTED STATES PATENT OFFICE- HENRY V. SCATTERGOOD AND CHARLES F. SCATTERGOOD, OF ALBANY,

NElV YORK, ASSIGNORS TO EDVIN D. BRAINARD, OF GREAT EARRING- TON, MASSACHUSETTS.

MODE OF FORMING TEETH ON CO'I 'TON-GI N SAWS.

SPECIFICATION forming part of Letters Patent No. 415,066, dated November 12, 1889.

Application filed September 14, 1886. Renewed September 3, 1889. Serial No. 322,896- (No model.)

To all whom it may concern:

Be it known that we, HENRY V. SCATTER- GOOD and CHARLES F. ScAT'rEReooD, both of the city and county of Albany, in the State of New York, haveinvented new and useful Improvements in the Mode of Forming Teeth on Cotton-Gin Saws, of which the following is a specification.

Our invention relates to improvements in the mode of making and forming teeth of cotton-gin saws; and the object of our improvements is to produce on saws made of sheet metal curved needle-pointed teeth, so as to obtain a nearly parallel space between the teeth, and thereby to'avoid the chipping of the cottonseed so commonly effected by the use of saws having angular spaces between their teeth, which chipping produces an injury to the quality of the staple by reason of the colored specks left adhering thereto.

In the accompanying drawings, which are herein referred to and form part of this specification, Figure 1 shows a magnified side view of a section of our saw-teeth after the first step of one process of manufacture. Fig. 2 shows said teeth after the second step of our process, and Fig. 3 the same after the third or final step of our process.

As represented in the drawings, A indicates the teeth of a gin-saw, made of sheet metal. Said teeth, as shown in Fig. 1, are formed by punching or cutting out the metal between two adjacent teeth, so that the latter will be arranged on a uniform forwardly-inclined angle to the radii of the circle,of the saw, and so that the foremost edges a of each of said teeth will be a straight line, or nearly so, and will be joined by a concave line a to the straight outline at the back a of the adjoining tooth, which back outline joins to the line of the foremost edge a at an .acute angle. The section of any of said teeth at this stage will be quadrangular, as shown by the deiached sectional view near Fig. 1.

The second step of our process, as illustrated by Fig. 2, consists in rounding off the corners of the cross-sectional form of the teeth into the form shown by the detached sectional View near Fig. A and in bringing the sides of the outer end of the teeth to a sharp point, as shown by the detached front elevation of the tooth near Fig. 2. The said rounding and pointing maybe effected either by swaging, milling, filing, or grinding, but is preferably done by a millingmachine adapted to that purpose.

The third and final step of ourprocess consists in bending the teeth A into a hook form (shown in Fig. 3) wherein the sides of the curved space between two adjacent teeth will be nearly parallel. The operation of bending may be performed when the teeth are either cold or warm, but preferably while warm, as we find that while warm the bending can be made more uniform and true. The operation of bending the teeth mechanically can readily be performed by means of a tool fitted to slide at right angles to the plane of the saw between two adjoining teeth, the said tool being curved transversely with an increasing pitch of curve as it is forced down betweentwo teeth, the culmination of said increasing curve being adapted to produce the required curvature for the finished tooth, and when preferred several of such tools can be arranged to operate simultaneously to bend a corresponding number of teeth at one time.

While we have described the tool above referred to for bending the teeth -mechanically, we do not confine ourselves to such an appliance, as we are aware that the same result can be obtained by means of other mechanisms.

By providing the spaces between every two adjoining teeth with the concave bottom a we avoid the trouble incident to every saw teeth on cotton-gin saws which consists of the following successive steps, to wit: first,

cuttinger punching outthe metal between two adj acent teeth, so as to leave the latierat a uniform forwardly-inclincd angle to the radii of the circle of the saw; second, rounding the square edges of said teeth and bringing the apex of each teeth to a sharp point, and, third, bending said teeth in the direction which they are primarily inclined into a curved-hook form, substantially as described, and for the purpose herein specified. 1o

HENRY V. S()A'I."JI'CRG()OI). CHARLES F. SCAT'IEHGOOI).

\Vitnesses:

WM. III. Low, S. 1-3, BREWER. 

